Some are playable. This is bound to happen since there's thousands of games. Most are "this is possible, but not there yet". And some games, mainly very 3D intensive ones are "too slow to consider right now".

I'm working on things as much as possible to bring performance up. I'm debating to work on compatibility first or performance. Performance is truly needed more at this point, but sometimes it's better to start with a better set of code.

In my inexpert opinion, do performance first and than compatibility. What's the point of being able to run FF7 if you can only run it at 4 FPS? My first opinion would be to use the real BIOS, if that makes it faster. Also, if you can, try to get .ZNX to work

Crash bandicoot tends to be one of those games that gives the emulator a hard time.
FF7 should run well above 30 FPS, closer to fullspeed at this point, but there's a bug causing it to crash when starting a new game in the US version. I'm working hard to fix this bug. Its a huge priority.